1/*	$NetBSD$	*/
2
3/*++
4/* NAME
5/*	lstat_as 3
6/* SUMMARY
7/*	lstat file as user
8/* SYNOPSIS
9/*	#include <sys/stat.h>
10/*	#include <lstat_as.h>
11/*
12/*	int	lstat_as(path, st, euid, egid)
13/*	const char *path;
14/*	struct stat *st;
15/*	uid_t	euid;
16/*	gid_t	egid;
17/* DESCRIPTION
18/*	lstat_as() looks up the file status of the named \fIpath\fR,
19/*	using the effective rights specified by \fIeuid\fR
20/*	and \fIegid\fR, and stores the result into the structure pointed
21/*	to by \fIst\fR.  A -1 result means the lookup failed.
22/*	This call does not follow symbolic links.
23/* DIAGNOSTICS
24/*	Fatal error: no permission to change privilege level.
25/* SEE ALSO
26/*	set_eugid(3) switch effective rights
27/* LICENSE
28/* .ad
29/* .fi
30/*	The Secure Mailer license must be distributed with this software.
31/* AUTHOR(S)
32/*	Wietse Venema
33/*	IBM T.J. Watson Research
34/*	P.O. Box 704
35/*	Yorktown Heights, NY 10598, USA
36/*--*/
37
38/* System library. */
39
40#include <sys_defs.h>
41#include <sys/stat.h>
42#include <unistd.h>
43
44/* Utility library. */
45
46#include "msg.h"
47#include "set_eugid.h"
48#include "lstat_as.h"
49#include "warn_stat.h"
50
51/* lstat_as - lstat file as user */
52
53int     lstat_as(const char *path, struct stat * st, uid_t euid, gid_t egid)
54{
55    uid_t   saved_euid = geteuid();
56    gid_t   saved_egid = getegid();
57    int     status;
58
59    /*
60     * Switch to the target user privileges.
61     */
62    set_eugid(euid, egid);
63
64    /*
65     * Lstat that file.
66     */
67    status = lstat(path, st);
68
69    /*
70     * Restore saved privileges.
71     */
72    set_eugid(saved_euid, saved_egid);
73
74    return (status);
75}
76